java写的一个简易的浏览器

import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.net.*;
import javax.swing.*;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;

public class HTTPBrowserDemo extends JFrame {
private JLabel jlAddress,jlInfo;
private JTextField jtfAddress;
private JEditorPane jtpShow;
private JPanel panel;
private JButton btnGO;

public static void main(String[] args) {
HTTPBrowserDemo hbd=new HTTPBrowserDemo();
}
HTTPBrowserDemo(){

jlAddress=new JLabel("地址");
jlInfo=new JLabel();
jtpShow=new JEditorPane();
panel=new JPanel();
jtfAddress=new JTextField(20);
btnGO=new JButton("转到");

add(panel,BorderLayout.NORTH);
add(jtpShow,BorderLayout.CENTER);
add(jlInfo,BorderLayout.SOUTH);

panel.add(jlAddress);
panel.add(jtfAddress);
panel.add(btnGO);

setVisible(true);
setSize(350, 280);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

btnGO.addActionListener(new ShowHTMLListener());
jtpShow.setEditable(false);
jtpShow.addHyperlinkListener(new MyHyperlinkListener());
}
class ShowHTMLListener implements ActionListener{
public void actionPerformed(ActionEvent e){
String str=jtfAddress.getText();
try {
if (!str.startsWith("http://")){
str="http://"+str;
}
jlInfo.setText("连接中...");
URL address=new URL(str);
jtpShow.setPage(address);
jlInfo.setText("完成");
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e2) {
// TODO: handle exception
}
}
}
class MyHyperlinkListener implements HyperlinkListener{
public void hyperlinkUpdate(HyperlinkEvent e) {
if(e.getEventType()==HyperlinkEvent.EventType.ACTIVATED){
JEditorPane pane=(JEditorPane)e.getSource();
try {
pane.setPage(e.getURL());
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
}
}